/*
 * Copyright 2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.instantexecution.serialization.codecs

import org.gradle.api.artifacts.transform.ArtifactTransform
import org.gradle.api.artifacts.transform.TransformAction
import org.gradle.api.artifacts.transform.TransformParameters
import org.gradle.api.internal.artifacts.transform.ArtifactTransformActionScheme
import org.gradle.api.internal.artifacts.transform.ArtifactTransformParameterScheme
import org.gradle.api.internal.artifacts.transform.DefaultTransformer
import org.gradle.api.internal.artifacts.transform.LegacyTransformer
import org.gradle.api.internal.attributes.ImmutableAttributes
import org.gradle.api.internal.file.FileCollectionFactory
import org.gradle.api.internal.file.FileLookup
import org.gradle.instantexecution.extensions.uncheckedCast
import org.gradle.instantexecution.serialization.Codec
import org.gradle.instantexecution.serialization.ReadContext
import org.gradle.instantexecution.serialization.WriteContext
import org.gradle.internal.fingerprint.AbsolutePathInputNormalizer
import org.gradle.internal.fingerprint.FileCollectionFingerprinterRegistry
import org.gradle.internal.hash.ClassLoaderHierarchyHasher
import org.gradle.internal.hash.HashCode
import org.gradle.internal.isolation.Isolatable
import org.gradle.internal.isolation.IsolatableFactory
import org.gradle.internal.operations.BuildOperationExecutor
import org.gradle.internal.snapshot.ValueSnapshotter
import org.gradle.internal.snapshot.impl.IsolatedArray
import org.gradle.workers.internal.IsolatableSerializerRegistry


internal
class DefaultTransformerCodec(
    private val buildOperationExecutor: BuildOperationExecutor,
    private val classLoaderHierarchyHasher: ClassLoaderHierarchyHasher,
    private val isolatableFactory: IsolatableFactory,
    private val valueSnapshotter: ValueSnapshotter,
    private val fileCollectionFactory: FileCollectionFactory,
    private val fileLookup: FileLookup,
    private val fileCollectionFingerprinterRegistry: FileCollectionFingerprinterRegistry,
    private val isolatableSerializerRegistry: IsolatableSerializerRegistry,
    private val parameterScheme: ArtifactTransformParameterScheme,
    private val actionScheme: ArtifactTransformActionScheme
) : Codec<DefaultTransformer> {
    override suspend fun WriteContext.encode(value: DefaultTransformer) {
        writeClass(value.implementationClass)

        // Write isolated parameters
        value.isolateParameters(fileCollectionFingerprinterRegistry)
        writeBinary(value.isolatedParameters.secondaryInputsHash.toByteArray())
        isolatableSerializerRegistry.writeIsolatable(this, value.isolatedParameters.isolatedParameterObject)

        // TODO - write more state
    }

    override suspend fun ReadContext.decode(): DefaultTransformer? {
        val implementationClass = readClass().asSubclass(TransformAction::class.java)
        val secondaryInputsHash = HashCode.fromBytes(readBinary())
        // TODO - should not need to do anything with the context classloader
        val previousContextClassLoader = Thread.currentThread().contextClassLoader
        Thread.currentThread().contextClassLoader = implementationClass.classLoader
        val isolatedParameters = try {
            isolatableSerializerRegistry.readIsolatable(this).uncheckedCast<Isolatable<out TransformParameters>>()
        } finally {
            Thread.currentThread().contextClassLoader = previousContextClassLoader
        }
        return DefaultTransformer(
            implementationClass,
            null,
            DefaultTransformer.IsolatedParameters(isolatedParameters, secondaryInputsHash),
            ImmutableAttributes.EMPTY,
            AbsolutePathInputNormalizer::class.java,
            AbsolutePathInputNormalizer::class.java,
            false,
            buildOperationExecutor,
            classLoaderHierarchyHasher,
            isolatableFactory,
            valueSnapshotter,
            fileCollectionFactory,
            fileLookup,
            parameterScheme.inspectionScheme.propertyWalker,
            actionScheme.instantiationScheme
        )
    }
}


internal
class LegacyTransformerCodec(
    private val actionScheme: ArtifactTransformActionScheme
) : Codec<LegacyTransformer> {
    override suspend fun WriteContext.encode(value: LegacyTransformer) {
        writeClass(value.implementationClass)
        writeBinary(value.secondaryInputsHash.toByteArray())
        // TODO - write more state, eg parameters
    }

    override suspend fun ReadContext.decode(): LegacyTransformer? {
        val implementationClass = readClass().asSubclass(ArtifactTransform::class.java)
        val secondaryInputsHash = HashCode.fromBytes(readBinary())
        return LegacyTransformer(
            implementationClass,
            IsolatedArray.EMPTY,
            secondaryInputsHash,
            actionScheme.instantiationScheme,
            ImmutableAttributes.EMPTY
        )
    }
}
